un ping de la passerelle depuis l'hyperviseur donne:
root@host:~>tcpdump -i em1 -ne icmp
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on em1, link-type EN10MB (Ethernet), capture size 262144 bytes
19:36:34.20160 fc:4d:d4:3e:d7:9a > 00:09:0f:09:00:02, ethertype IPv4 (0x0800), length 98: 192.168.2.2 > 192.168.2.254: ICMP echo request, id 9477, seq 116, length 64
19:36:34.20390 00:09:0f:09:00:02 > fc:4d:d4:3e:d7:9a, ethertype IPv4 (0x0800), length 98: 192.168.2.254 > 192.168.2.2: ICMP echo reply, id 9477, seq 116, length 64
19:36:35.20136 fc:4d:d4:3e:d7:9a > 00:09:0f:09:00:02, ethertype IPv4 (0x0800), length 98: 192.168.2.2 > 192.168.2.254: ICMP echo request, id 9477, seq 117, length 64
19:36:35.20327 00:09:0f:09:00:02 > fc:4d:d4:3e:d7:9a, ethertype IPv4 (0x0800), length 98: 192.168.2.254 > 192.168.2.2: ICMP echo reply, id 9477, seq 117, length 64
19:36:36.20130 fc:4d:d4:3e:d7:9a > 00:09:0f:09:00:02, ethertype IPv4 (0x0800), length 98: 192.168.2.2 > 192.168.2.254: ICMP echo request, id 9477, seq 118, length 64
19:36:36.20331 00:09:0f:09:00:02 > fc:4d:d4:3e:d7:9a, ethertype IPv4 (0x0800), length 98: 192.168.2.254 > 192.168.2.2: ICMP echo reply, id 9477, seq 118, length 64
19:36:37.20121 fc:4d:d4:3e:d7:9a > 00:09:0f:09:00:02, ethertype IPv4 (0x0800), length 98: 192.168.2.2 > 192.168.2.254: ICMP echo request, id 9477, seq 119, length 64
19:36:37.20315 00:09:0f:09:00:02 > fc:4d:d4:3e:d7:9a, ethertype IPv4 (0x0800), length 98: 192.168.2.254 > 192.168.2.2: ICMP echo reply, id 9477, seq 119, length 64
19:36:38.20110 fc:4d:d4:3e:d7:9a > 00:09:0f:09:00:02, ethertype IPv4 (0x0800), length 98: 192.168.2.2 > 192.168.2.254: ICMP echo request, id 9477, seq 120, length 64
19:36:38.20329 00:09:0f:09:00:02 > fc:4d:d4:3e:d7:9a, ethertype IPv4 (0x0800), length 98: 192.168.2.254 > 192.168.2.2: ICMP echo reply, id 9477, seq 120, length 64
19:36:39.20140 fc:4d:d4:3e:d7:9a > 00:09:0f:09:00:02, ethertype IPv4 (0x0800), length 98: 192.168.2.2 > 192.168.2.254: ICMP echo request, id 9477, seq 121, length 64
19:36:39.20311 00:09:0f:09:00:02 > fc:4d:d4:3e:d7:9a, ethertype IPv4 (0x0800), length 98: 192.168.2.254 > 192.168.2.2: ICMP echo reply, id 9477, seq 121, length 64
19:36:40.20145 fc:4d:d4:3e:d7:9a > 00:09:0f:09:00:02, ethertype IPv4 (0x0800), length 98: 192.168.2.2 > 192.168.2.254: ICMP echo request, id 9477, seq 122, length 64
19:36:40.20351 00:09:0f:09:00:02 > fc:4d:d4:3e:d7:9a, ethertype IPv4 (0x0800), length 98: 192.168.2.254 > 192.168.2.2: ICMP echo reply, id 9477, seq 122, length 64
19:36:41.20155 fc:4d:d4:3e:d7:9a > 00:09:0f:09:00:02, ethertype IPv4 (0x0800), length 98: 192.168.2.2 > 192.168.2.254: ICMP echo request, id 9477, seq 12, length 64
19:36:41.20413 00:09:0f:09:00:02 > fc:4d:d4:3e:d7:9a, ethertype IPv4 (0x0800), length 98: 192.168.2.254 > 192.168.2.2: ICMP echo reply, id 9477, seq 12, length 64
^C
16 packets captured
16 packets received by filter
0 packets dropped by kernel
On voit bien les echo reply
L'autre est effectué est fait sur une autre machine (192.168.2.1). le ping est lancé vers cette machine depuis la VM. le tcpdump lancé sur l'autre machine ne voyait pas les paquets arrivés.